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77259L Rev. 4 12/16/03 Z4M/Z6M Maintenance Manual Page 1-9

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The Z4M/Z6M printers have a communication buffer that stores the incoming data until

that information can be acted upon (imaged). Communication handshaking (DTR/DSR

control signals or XON/XOFF control codes) is used to control when the host can send

data to the printer.

The size of the buffer is 5000 characters. As data is received by the printer, the processor

monitors the number of characters in the buffer. If the buffer is filled beyond 4744

characters, the printer will turn the DTR control lead to the OFF condition (negative

voltage) or transmit an XOFF (DC-3) control character to the host. When the buffer

empties below 4250 characters, the printer will turn DTR to the ON condition (positive

voltage) or transmit an XON (DC-1) control character to the host.

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The DTE port is a DB25S connector located at the rear of the Z4M/Z6M printers. It

provides connection to a host via RS-232, RS-422 or RS-485 signaling. Refer to Figure

1-2 for wiring diagrams.

The pin outs and signal descriptions for the DTE port are as follows:

Pin 1—FG (Frame ground) for cable shield.

Pin 2—TXD (RS-232 Transmit Data): Output from printer

Pin 3—RXD (RS-232 Receive Data): Input to printer

Pin 4—RTS (RS-232 Request to Send): Output from printer

Pin 6—DSR (RS-232 Data Set Ready): Input to printer

Pin 7—SG (Signal ground) for RS-232

Pin 9—+5VDC source (1 Amp maximum)

Pin 11—SGR (Signal ground reference) RS-422/RS-485

Pin 13—Data input B(-) RS-422/RS-485

Pin 14—Data output B(-) RS-422/RS-485

Pin 16—Data input A(+) RS-422/RS-485

Pin 19—Data output A(+) RS-422/RS-485

Pin 20—DTR (RS-232 Data Terminal Ready)

Note • Pins 5, 8, 10, 12, 15, 17-18 and 21-25 are not used and are not

terminated.

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